![]() A compound is made up of two (or more) different kinds of atoms. The view of solid KI shown above is our first microscopic example of a compound. The balanced chemical equation reinforces this idea. Atoms were neither created, destroyed, divided into parts, or changed into other kinds of atoms during the chemical reaction. Notice that there are just as many potassium atoms after the reaction as there were before the reaction. This illustrates Dalton’s third postulate, which states that atoms are the units of chemical changes. When the elements potassium and iodine are heated together, they react even more energetically than potassium and water, to give the compound KI according to the equation above. Rather, there's an extended lattice of alternating K 1+ ions and I 1- ions. This equation may be interpreted microscopically to mean that 1 potassium atom and 1 iodine molecule react to form 2 potassium iodide units, but there is no such thing as an isolated KI unit. Liquids are designated by (l), gases by (g), and aqueous (water) solutions as (aq). The solid state of the reactants is indicated by the "s" in parentheses, and the crystalline state of the product is indicated by "(c)". ![]() Here we have three views of the same reaction: At the top, the macroscopic appearance of the reactants and products below them, the microscopic or atomic level representation of the atoms or molecules and finally, a symbolic represenation in the form of a chemical equation. Map with mostly yellow regions with few red regions and a significant orange regions across areas of Russia.Ģ K (s) + I 2 (s) → 2 KI (c) Reactants → Products Luckily, most foods (especially oranges, potatos, and bananas) supply potassium, and KI is only necessary as therapy. ![]() The Recommended Daily Allowances (RDA) for iodine and potassium are 150 µg and 4700 mg respectively, so we need about 30,000 times as much potassium as iodine. Potassium deficiency (hypokalemia, after kallium, the German name for potassium and source of the symbol, K) leads to muscle weakness, cramps, and constipation. Iodine deficiency leads to thyroid dysfunction and goiter, but very little iodine is required, so goiter is rare. Both potassium and iodine are essential nutrients, but each must be supplied in a compound if it is to be of any use (let alone nontoxic) to the body. In a previous section on Elemental diet we looked at essential minerals that are sometimes called "elements", but are really only usable to our bodies when they are supplied as "compounds".
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